Worked on backend development for the koreader/koreader repository, focusing on code maintenance related to filename handling. The main contribution involved removing redundant UTF-8 fixup logic, streamlining the sanitization process by relying on the existing util.getSafeFilename() function, which internally manages UTF-8 corrections. This cleanup reduced code duplication and simplified the maintenance path, lowering the risk of future regressions in filename processing. The work was implemented using Lua and demonstrated careful attention to maintainability and clarity, with changes clearly documented in commit messages. No bugs were fixed during this period, and the primary focus remained on backend code quality and efficiency.